Immuno-biosensor for Detection of CD20-Positive Cells Using Surface Plasmon Resonance

Area of Science:

• Biophysical Chemistry
• Immunology
• Biotechnology

Background:

• Surface plasmon resonance (SPR) sensing offers real-time analysis of molecular interactions.
• Monoclonal antibodies (MAbs) target specific antigens, enabling applications in immuno-sensors and therapeutics.
• CD20 is a key surface protein on B lymphocytes, targeted in B-cell disorders.

Purpose of the Study:

• To investigate the binding ability of an anti-CD20 MAb to surface antigens on intact cells using SPR.
• To compare two distinct immobilization strategies for anti-CD20 MAb on gold chips.

Main Methods:

• Utilized SPR technique to assess molecular interactions.
• Immobilized anti-CD20 MAb onto gold chips using two methods: MUA (11-mercaptoundecanoic acid) and Staphylococcus aureus protein A (SpA).
• Analyzed binding interactions by injecting CD20-positive Raji cells and CD20-negative MOLT-4 cells as controls.

Main Results:

• Confirmed efficient binding of the anti-CD20 MAb to the surface antigens of Raji cells via both immobilization methods.
• Demonstrated minimal affinity of the anti-CD20 MAb to MOLT-4 cells, serving as a negative control.
• Validated the specificity and affinity of the MAb for CD20-positive cells.

Conclusions:

• The anti-CD20 MAb exhibits acceptable affinity and specificity for target antigens on intact cells.
• SPR is a suitable technique for the immuno-detection of CD20-positive intact cells.
• The findings support the potential use of this MAb in SPR-based diagnostic or therapeutic strategies.